code.cpp

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 *
 * Code for the book "DAILY 43: Algorithmic Problems for Coding Interviews: Easy level, C++ edition"
 *
 * Licensed under the GNU General Public License, Version 3.0 (the "License");
 * you may not use this file except in compliance with the License.
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#include <iostream>
#include <algorithm>

// Definition for a binary tree node
struct TreeNode {
    int val;
    TreeNode* left;
    TreeNode* right;
    TreeNode(int x) : val(x), left(NULL), right(NULL) {}
};

int maxDepth(TreeNode* root) {
    int maxLeft = 0, maxRight = 0;
    if (!root)
        return 0;
    maxLeft = maxDepth(root->left);
    maxRight = maxDepth(root->right);
    return std::max(maxLeft, maxRight) + 1;
}

int main() {
    // Create a sample binary tree
    TreeNode* root = new TreeNode(3);
    root->left = new TreeNode(9);
    root->right = new TreeNode(20);
    root->right->left = new TreeNode(15);
    root->right->right = new TreeNode(7);

    // Calculate and print the maximum depth of the binary tree
    std::cout << "Maximum depth of the binary tree is: " << maxDepth(root) << std::endl;

    return 0;
}